moparcanuck
Deceased, But not forgotton
In your mostly stock 440 Six Pack, what colour springs are you running in your outer carbs?
this is kind of subjective to each car. motor combo's/converer/weight of car/timing/temp you run the motor at are just some of the things that play into it. get the motor up to operating temp, start out with the stiff springs and work your way down. i like to WOT it from a cruise speed in 3rd gear. once you feel it start to bog go back up one spring.
blacks are an absolute no-no. the carbs will never open with them. '69 a12 cars came with purples and 70-71 came with yellows. i did a track test on a near stock engine in a 69 b-body automatic. for every step heavier than yellow the car slowed down a tenth. holley has published opening rates for the springs. in a single 4bbl big block chevy test the black spring never let the 780 carb fully open a WOT. why would two black springs work if one won't. i've messed with 6-paks since 1970. had several sets. tried factory vacuum carbs, corvette carbs, the direct connection mechanicals, worked with several folks who've raced them in brackets and street/strip. in my experience the vacuum carbs were the overall best and yellow springs gave the best performance with purples making a nice street/strip compromise.
In your mostly stock 440 Six Pack, what colour springs are you running in your outer carbs?